Surface Modification of Sporopollenin with Calixarene Derivative : Characterization and Application for Metal Removal
2012
Gubbuk, Ilkay Hilal | Gürfidan, Leyla | Erdemir, Serkan | Yılmaz, Mustafa
In this study, p-tert-butylcalix[4]-aza-crown (CAC) immobilized sporopollenin (Sp) was used as a sorbent for the removal of Cu(II), Pb(II) and Zn(II) from aqueous media. Sporopollenin was firstly functionalized with 3-chloropropyltrimethoxysilane (CPTS) in order to obtain chloro-sporopollenin (Sp-Cl). The Sp-Cl was reacted subsequently with CAC yielding CAC-bonded sporopollenin (Sp-Cl-CAC). The new sorbent was characterized by infrared spectroscopy (FTIR), thermal analysis (TG/DTG) and scanning electron microscopy (SEM). The sorption properties of modified sorbent (Sp-Cl-CAC) are also investigated. The optimum pH values for the separation of metal ions from aqueous solution onto Sp-Cl-CAC were 5.0 for Pb(II) and Cu(II) and 5.5 for Zn(II). The maximum sorption capacities for Cu(II), Pb(II) and Zn(II) were 0.07 (4.44 mg g), 0.07 (4.58 mg g) and 0.14 (29.00 mg g) mmol g, respectively. Sorption thermodynamic parameters of such as free energy ( ∆G), enthalpy ( ∆H), and entropy ( ∆S) were evaluated.
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